1. (noun) steadiness of mind under stress

• calm
• calmness
• composure

1. (noun) steadiness of mind under stress

• aplomb
• assuredness
• cool
• poise
• sang-froid
• placidity
• quiet
• repose
• serenity
• tranquility
• tranquillity

1. (noun) steadiness of mind under stress

• disposition
• temperament

1. (noun) steadiness of mind under stress

• calm
• sedate
• tranquilize
• tranquillise
• tranquillize
• calm
• calm down
• chill out
• cool it
• cool off
• settle down
• simmer down
• calm
• calm
• serene
• serene
• tranquil
• tranquil
• unagitated
• unagitated
• collected
• equanimous
• poised
• self-collected
• self-contained
• self-possessed
• compose

1. (noun) steadiness of mind under stress

• discomposure